for zinc was found to vary within a small range (typically 0.05 - 0.20 1/hr).
Higher rate constants for zinc typically were obtained at higher pH.
Comparisons were made between partition coefficients and rate constants
obtained from batch and column tests to determine if parameters obtained from
batch tests can be used for design. The comparison for TCE showed that similar
partition coefficients and rate constants are obtained using both methods. For
the herbicides, the partition coefficients and rate constants obtained from the
batch tests tended to be higher than those from the column tests. Conservative
reduction factors of 2.0 and 1.6 have been recommended when using partition
coefficients and rate constants obtained from batch tests for design of PRBs for
alachlor and metolachlor. The comparison made for zinc indicated that the batch
and column tests yield similar partition coefficients and rate constants provided
that the solution pH is the same.
Empirical equations were developed using multivariate regression to
predict partition coefficients and rate constants as a function of properties of the
foundry sand such as iron content, total organic carbon content, and clay
content.  These equations can be used for feasibility assessments and
preliminary design calculations. However, they are not meant as a substitute for
batch and column testing.
Tests were also conducted to evaluate the leaching characteristics of
foundry sands. Batch water leach tests, column leach tests, and total elemental
analyses were conducted. The water leach tests and total elemental analyses